7.3. Upgrading Operating Systems
If you add an OS to a machine that doesn't currently have one (recently formatted, built from scratch, and so on), that is installing. If you add an OS so that you can dual-boot (choose which one to run at start), that is installing. If you replace one OS with another and attempt to keep the same data/application files, that is upgrading.
Whereas installation can typically be done over any existing OS, upgrading can only be done from OSs that are generally compatible with the one you're adding. For example, with Windows Vista you can upgrade to various versions based on the operating system that you are coming from. Table 7.3 lists the upgrade paths for each Windows Vista version based on the operating system ...
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